Typical signs
- Open cracks, broken edge, depression, pothole or lifted slab.
Where it is often found
- Asphalt, concrete and paver drives and areas near drains.
What it can mean
- Weak base, water, freeze-thaw, roots, heavy traffic or unsupported edge.
What to check next
- Observe drainage and seasonal progression.
- Probe accessible base and note loads.
Reasonable immediate actions
- Mark hazardous level changes and limit loads.
When to stop and call a professional
- Settlement tied to a utility, large heave, adjacent wall or major drainage.
Prevention
- Adequate base and compaction, drainage, sealed joints and early maintenance.